Net Sales - Summary of Disaggregation of Net Sales by Geographical Region and Segment and Product Group (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Disaggregation Of Revenue [Line Items]
Disaggregation of Net Sales	$ 1,591	$ 1,615	$ 2,972	$ 2,983
Other Non-Reportable Segment [Member]
Disaggregation Of Revenue [Line Items]
Disaggregation of Net Sales	13	15	25	27
Transferred at a Point in Time [Member]
Disaggregation Of Revenue [Line Items]
Disaggregation of Net Sales	1,591	1,615	2,972	2,983
Transferred at a Point in Time [Member] \| Titanium Technologies [Member]
Disaggregation Of Revenue [Line Items]
Disaggregation of Net Sales	661	657	1,220	1,254
Transferred at a Point in Time [Member] \| Thermal & Specialized Solutions [Member]
Disaggregation Of Revenue [Line Items]
Disaggregation of Net Sales	591	597	1,158	1,063
Transferred at a Point in Time [Member] \| Advanced Performance Materials [Member]
Disaggregation Of Revenue [Line Items]
Disaggregation of Net Sales	326	346	569	639
Transferred at a Point in Time [Member] \| Other Non-Reportable Segment [Member]
Disaggregation Of Revenue [Line Items]
Disaggregation of Net Sales	13	15	25	27
Transferred at a Point in Time [Member] \| North America [Member]
Disaggregation Of Revenue [Line Items]
Disaggregation of Net Sales	754	753	1,417	1,372
Transferred at a Point in Time [Member] \| North America [Member] \| Titanium Technologies [Member]
Disaggregation Of Revenue [Line Items]
Disaggregation of Net Sales	267	282	502	550
Transferred at a Point in Time [Member] \| North America [Member] \| Thermal & Specialized Solutions [Member]
Disaggregation Of Revenue [Line Items]
Disaggregation of Net Sales	340	336	665	569
Transferred at a Point in Time [Member] \| North America [Member] \| Advanced Performance Materials [Member]
Disaggregation Of Revenue [Line Items]
Disaggregation of Net Sales	140	125	235	236
Transferred at a Point in Time [Member] \| North America [Member] \| Other Non-Reportable Segment [Member]
Disaggregation Of Revenue [Line Items]
Disaggregation of Net Sales	7	10	15	17
Transferred at a Point in Time [Member] \| Asia Pacific [Member]
Disaggregation Of Revenue [Line Items]
Disaggregation of Net Sales	317	334	555	609
Transferred at a Point in Time [Member] \| Asia Pacific [Member] \| Titanium Technologies [Member]
Disaggregation Of Revenue [Line Items]
Disaggregation of Net Sales	124	125	200	229
Transferred at a Point in Time [Member] \| Asia Pacific [Member] \| Thermal & Specialized Solutions [Member]
Disaggregation Of Revenue [Line Items]
Disaggregation of Net Sales	72	59	142	113
Transferred at a Point in Time [Member] \| Asia Pacific [Member] \| Advanced Performance Materials [Member]
Disaggregation Of Revenue [Line Items]
Disaggregation of Net Sales	117	147	207	261
Transferred at a Point in Time [Member] \| Asia Pacific [Member] \| Other Non-Reportable Segment [Member]
Disaggregation Of Revenue [Line Items]
Disaggregation of Net Sales	4	3	6	6
Transferred at a Point in Time [Member] \| Europe, the Middle East, and Africa [Member]
Disaggregation Of Revenue [Line Items]
Disaggregation of Net Sales	312	330	615	626
Transferred at a Point in Time [Member] \| Europe, the Middle East, and Africa [Member] \| Titanium Technologies [Member]
Disaggregation Of Revenue [Line Items]
Disaggregation of Net Sales	156	156	307	297
Transferred at a Point in Time [Member] \| Europe, the Middle East, and Africa [Member] \| Thermal & Specialized Solutions [Member]
Disaggregation Of Revenue [Line Items]
Disaggregation of Net Sales	97	112	195	210
Transferred at a Point in Time [Member] \| Europe, the Middle East, and Africa [Member] \| Advanced Performance Materials [Member]
Disaggregation Of Revenue [Line Items]
Disaggregation of Net Sales	57	60	109	116
Transferred at a Point in Time [Member] \| Europe, the Middle East, and Africa [Member] \| Other Non-Reportable Segment [Member]
Disaggregation Of Revenue [Line Items]
Disaggregation of Net Sales	2	2	4	3
Transferred at a Point in Time [Member] \| Latin America [Member]
Disaggregation Of Revenue [Line Items]
Disaggregation of Net Sales	208	198	385	376
Transferred at a Point in Time [Member] \| Latin America [Member] \| Titanium Technologies [Member]
Disaggregation Of Revenue [Line Items]
Disaggregation of Net Sales	114	94	211	178
Transferred at a Point in Time [Member] \| Latin America [Member] \| Thermal & Specialized Solutions [Member]
Disaggregation Of Revenue [Line Items]
Disaggregation of Net Sales	82	90	156	171
Transferred at a Point in Time [Member] \| Latin America [Member] \| Advanced Performance Materials [Member]
Disaggregation Of Revenue [Line Items]
Disaggregation of Net Sales	12	14	18	26
Transferred at a Point in Time [Member] \| Latin America [Member] \| Other Non-Reportable Segment [Member]
Disaggregation Of Revenue [Line Items]
Disaggregation of Net Sales	0	0	0	1
Transferred at a Point in Time [Member] \| Titanium Dioxide and Other Minerals [Member] \| Titanium Technologies [Member]
Disaggregation Of Revenue [Line Items]
Disaggregation of Net Sales	639	629	1,180	1,204
Transferred at a Point in Time [Member] \| Minerals And Other [Member] \| Titanium Technologies [Member]
Disaggregation Of Revenue [Line Items]
Disaggregation of Net Sales	22	28	40	50
Transferred at a Point in Time [Member] \| Opteon Refrigerants [Member] \| Thermal & Specialized Solutions [Member]
Disaggregation Of Revenue [Line Items]
Disaggregation of Net Sales	337	375	650	654
Transferred at a Point in Time [Member] \| Freon Refrigerants [Member] \| Thermal & Specialized Solutions [Member]
Disaggregation Of Revenue [Line Items]
Disaggregation of Net Sales	150	123	312	220
Transferred at a Point in Time [Member] \| Foam, Propellants, and Other [Member] \| Thermal & Specialized Solutions [Member]
Disaggregation Of Revenue [Line Items]
Disaggregation of Net Sales	104	99	196	189
Transferred at a Point in Time [Member] \| Advanced Materials [Member] \| Advanced Performance Materials [Member]
Disaggregation Of Revenue [Line Items]
Disaggregation of Net Sales	184	214	326	391
Transferred at a Point in Time [Member] \| Performance Solutions [Member] \| Advanced Performance Materials [Member]
Disaggregation Of Revenue [Line Items]
Disaggregation of Net Sales	142	132	243	248
Transferred at a Point in Time [Member] \| Performance Chemicals and Intermediates [Member] \| Other Non-Reportable Segment [Member]
Disaggregation Of Revenue [Line Items]
Disaggregation of Net Sales	$ 13	$ 15	$ 25	$ 27